412 



Bashford Dean IsAemoriai Volume. 



unsuitable paper and details are obscure. The digestive tube appears as a nearly straight 

 tube in which three main regions are recognizable; there is possibly a small convolution 

 in the region of transition from stomach to intestine. 



A continuous median dorsal mesentery, more fully described in the section on the 

 urogenital system, supports the digestive tube of Chlamydoselachus throughout its 

 its length excepting the posterior four-fifths of the valvular intestine and the entire 

 rectum. The rectal gland has a special mesentery which is evidently an isolated division 

 of the dorsal mesentery. The mesentery supporting the common bUe duct appears to be 

 a ventral mesentery, but in my specimens it is considerably mutilated and some of its re- 

 lations are obscure. 



TABLE I 



Length (in millimeters) of the digestive tube and its divisions in comparison with the total body length 

 and the length of the body ca\aty anterior to the cloacal aperture, in three adult female specimens of 

 CMamydoselachus. 



Specimen 

 Number 



Total Body 

 Length 



Esophagus 

 and Cardia 



Pyloric 

 Vestibule 



Pylorus 



Bursa | Valvular , Colon and 

 Entiana ; Intestine Rectum 



'^°^ ' Body 



^^^'= . Cavity 

 Tube 



I 



n 

 m 



1350 

 1485 

 1550 



330 

 365 

 440 



35 



Absent 



25 



33 

 33 

 25 



36 190 40 

 27 240 80 

 43 ! 230 40 



664 

 745 

 803 



564 

 640 

 600 



THE LIVER 



In my specimens 11 and III the Hver is nearly all missing; but in Xo. I the Kver is 

 intact and (macroscopically) in an excellent state of preservation. Therefore my descrip- 

 tion is based entirely on a study of specimen No. I. 



The Hver of Chlamydoseladnus (Text-figure 72) is a very large organ. It consists 

 mainly of two lobes (r.I. and 1. 1.), one on each side of the body, extending the entire 

 length (about 600 mm.; of the body cavity including the portions lateral to the cloaca. 

 At their anterior ends, these lobes are continuous with the short unpaired portion of the 

 Hver w^hich is median in position. The lobes are of equal size and aHke in form save that 

 there is a sHght excavation near the distal end of the left lobe. Thus the form of the 

 Hver is decidedly symmetrical. Each lobe is flattened; the greatest wadth of a lobe is 

 about 50 mm., but the thickness does not exceed 12 m m. In Text-figure 72 the lobes are 

 shown in broad view, but in their natural position they would probably appear in an 

 edge view. The unpaired portion of the Hver is about 60 mm. wnde, 55 mm. long, and 

 8 mm. thick; it is wrapped about the ventral and lateral surfaces of the esophagus. The 

 gall bladder (g.b.) is 42 mm. long and 16 mm. wide. It is attached to the ventral and 

 median surface of the unpaired portion of the Hver, and projects sHghtly beyond its 

 caudal margin. 



